From a322035f4d41122760d4e384d5cad3cec9e0774d Mon Sep 17 00:00:00 2001
From: Seiya <20365512+seiyab@users.noreply.github.com>
Date: Tue, 16 Jun 2026 02:26:37 +0900
Subject: [PATCH] Add regression tests for v3.9 milestone (#19354)

---
 .../__snapshots__/format.test.js.snap         | 47 +++++++++++++++++++
 .../format/markdown/blockquote/issue-14228.md |  2 +
 .../__snapshots__/format.test.js.snap         | 18 +++++++
 .../link/parser-regression/isssue-17682.md    |  3 ++
 .../__snapshots__/format.test.js.snap         | 43 +++++++++++++++++
 .../list/parser-regression/issue-17778.md     |  5 ++
 .../list/parser-regression/issue-9314.md      |  5 ++
 7 files changed, 123 insertions(+)
 create mode 100644 tests/format/markdown/blockquote/issue-14228.md
 create mode 100644 tests/format/markdown/link/parser-regression/isssue-17682.md
 create mode 100644 tests/format/markdown/list/parser-regression/issue-17778.md
 create mode 100644 tests/format/markdown/list/parser-regression/issue-9314.md

diff --git a/tests/format/markdown/blockquote/__snapshots__/format.test.js.snap b/tests/format/markdown/blockquote/__snapshots__/format.test.js.snap
index 0ce69b57e..14cf13f55 100644
--- a/tests/format/markdown/blockquote/__snapshots__/format.test.js.snap
+++ b/tests/format/markdown/blockquote/__snapshots__/format.test.js.snap
@@ -619,6 +619,53 @@ This paragraph
 ================================================================================
 `;
 
+exports[`issue-14228.md - {"proseWrap":"always"} format 1`] = `
+====================================options=====================================
+parsers: ["markdown"]
+proseWrap: "always"
+                                                      printWidth: 80 (default) |
+=====================================input======================================
+> **Source:**
+> [packages/react-dom/src/client/ReactDOMComponent.js:225](https://github.com/facebook/react/blob/8a8d973d3cc5623676a84f87af66ef9259c3937c/packages/react-dom/src/client/ReactDOMComponent.js#L225)
+
+=====================================output=====================================
+> **Source:**
+> [packages/react-dom/src/client/ReactDOMComponent.js:225](https://github.com/facebook/react/blob/8a8d973d3cc5623676a84f87af66ef9259c3937c/packages/react-dom/src/client/ReactDOMComponent.js#L225)
+
+================================================================================
+`;
+
+exports[`issue-14228.md - {"proseWrap":"never"} format 1`] = `
+====================================options=====================================
+parsers: ["markdown"]
+proseWrap: "never"
+                                                      printWidth: 80 (default) |
+=====================================input======================================
+> **Source:**
+> [packages/react-dom/src/client/ReactDOMComponent.js:225](https://github.com/facebook/react/blob/8a8d973d3cc5623676a84f87af66ef9259c3937c/packages/react-dom/src/client/ReactDOMComponent.js#L225)
+
+=====================================output=====================================
+> **Source:** [packages/react-dom/src/client/ReactDOMComponent.js:225](https://github.com/facebook/react/blob/8a8d973d3cc5623676a84f87af66ef9259c3937c/packages/react-dom/src/client/ReactDOMComponent.js#L225)
+
+================================================================================
+`;
+
+exports[`issue-14228.md - {"proseWrap":"preserve"} format 1`] = `
+====================================options=====================================
+parsers: ["markdown"]
+proseWrap: "preserve"
+                                                      printWidth: 80 (default) |
+=====================================input======================================
+> **Source:**
+> [packages/react-dom/src/client/ReactDOMComponent.js:225](https://github.com/facebook/react/blob/8a8d973d3cc5623676a84f87af66ef9259c3937c/packages/react-dom/src/client/ReactDOMComponent.js#L225)
+
+=====================================output=====================================
+> **Source:**
+> [packages/react-dom/src/client/ReactDOMComponent.js:225](https://github.com/facebook/react/blob/8a8d973d3cc5623676a84f87af66ef9259c3937c/packages/react-dom/src/client/ReactDOMComponent.js#L225)
+
+================================================================================
+`;
+
 exports[`list.md - {"proseWrap":"always"} format 1`] = `
 ====================================options=====================================
 parsers: ["markdown"]
diff --git a/tests/format/markdown/blockquote/issue-14228.md b/tests/format/markdown/blockquote/issue-14228.md
new file mode 100644
index 000000000..21fbbf03b
--- /dev/null
+++ b/tests/format/markdown/blockquote/issue-14228.md
@@ -0,0 +1,2 @@
+> **Source:**
+> [packages/react-dom/src/client/ReactDOMComponent.js:225](https://github.com/facebook/react/blob/8a8d973d3cc5623676a84f87af66ef9259c3937c/packages/react-dom/src/client/ReactDOMComponent.js#L225)
diff --git a/tests/format/markdown/link/parser-regression/__snapshots__/format.test.js.snap b/tests/format/markdown/link/parser-regression/__snapshots__/format.test.js.snap
index c49826470..d3eec3d97 100644
--- a/tests/format/markdown/link/parser-regression/__snapshots__/format.test.js.snap
+++ b/tests/format/markdown/link/parser-regression/__snapshots__/format.test.js.snap
@@ -1,5 +1,23 @@
 // Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
 
+exports[`isssue-17682.md - {"proseWrap":"always"} format 1`] = `
+====================================options=====================================
+parsers: ["markdown"]
+proseWrap: "always"
+                                                      printWidth: 80 (default) |
+=====================================input======================================
+[link__1](#link__1)
+
+link 1{#link__1}
+
+=====================================output=====================================
+[link__1](#link__1)
+
+link 1{#link__1}
+
+================================================================================
+`;
+
 exports[`issue-6078.md - {"proseWrap":"always"} format 1`] = `
 ====================================options=====================================
 parsers: ["markdown"]
diff --git a/tests/format/markdown/link/parser-regression/isssue-17682.md b/tests/format/markdown/link/parser-regression/isssue-17682.md
new file mode 100644
index 000000000..0ee463f4b
--- /dev/null
+++ b/tests/format/markdown/link/parser-regression/isssue-17682.md
@@ -0,0 +1,3 @@
+[link__1](#link__1)
+
+link 1{#link__1}
diff --git a/tests/format/markdown/list/parser-regression/__snapshots__/format.test.js.snap b/tests/format/markdown/list/parser-regression/__snapshots__/format.test.js.snap
index ff12ac2aa..2ef4210fc 100644
--- a/tests/format/markdown/list/parser-regression/__snapshots__/format.test.js.snap
+++ b/tests/format/markdown/list/parser-regression/__snapshots__/format.test.js.snap
@@ -18,6 +18,28 @@ proseWrap: "always"
 ================================================================================
 `;
 
+exports[`issue-9314.md - {"proseWrap":"always"} format 1`] = `
+====================================options=====================================
+parsers: ["markdown"]
+proseWrap: "always"
+                                                      printWidth: 80 (default) |
+=====================================input======================================
+# Bibliography
+
+-
+
+---
+
+=====================================output=====================================
+# Bibliography
+
+-
+
+---
+
+================================================================================
+`;
+
 exports[`issue-10063.md - {"proseWrap":"always"} format 1`] = `
 ====================================options=====================================
 parsers: ["markdown"]
@@ -155,6 +177,27 @@ Why is this section indented?
 ================================================================================
 `;
 
+exports[`issue-17778.md - {"proseWrap":"always"} format 1`] = `
+====================================options=====================================
+parsers: ["markdown"]
+proseWrap: "always"
+                                                      printWidth: 80 (default) |
+=====================================input======================================
+1. list item
+999999999. list item
+
+1. list item
+1000000000. ordered list marker can't have more than 9 digits
+
+=====================================output=====================================
+1. list item
+2. list item
+
+3. list item 1000000000. ordered list marker can't have more than 9 digits
+
+================================================================================
+`;
+
 exports[`issue-19146.md - {"proseWrap":"always"} format 1`] = `
 ====================================options=====================================
 parsers: ["markdown"]
diff --git a/tests/format/markdown/list/parser-regression/issue-17778.md b/tests/format/markdown/list/parser-regression/issue-17778.md
new file mode 100644
index 000000000..f7a39f676
--- /dev/null
+++ b/tests/format/markdown/list/parser-regression/issue-17778.md
@@ -0,0 +1,5 @@
+1. list item
+999999999. list item
+
+1. list item
+1000000000. ordered list marker can't have more than 9 digits
diff --git a/tests/format/markdown/list/parser-regression/issue-9314.md b/tests/format/markdown/list/parser-regression/issue-9314.md
new file mode 100644
index 000000000..c3afaa225
--- /dev/null
+++ b/tests/format/markdown/list/parser-regression/issue-9314.md
@@ -0,0 +1,5 @@
+# Bibliography
+
+-
+
+---